基于电成像测井的视地层水电阻率谱方法在低对比度储层评价中的应用

Application of Evaluation Method of Low-contrast Reservoir Based on Imaging Apparent Formation Water Resistivity Spectrum in the Evaluation of Reservoirs with Low Contrast Level

从含不同流体的储层地层水矿化度及地层水电阻率特征入手,基于电成像测井能够反映储层电性及含油性特征,结合阿尔奇公式推导出视地层水电阻率谱计算方法,定性描述含不同流体的储层视地层水电阻率谱分布特征,并进行特征变量的量化及优选,通过地层水电阻率谱形态及特征参数交会图分析,较为直观地对研究区进行储层有效性及流体判别。该方法在F油田进行了多口井的应用,取得了良好效果,拓展了成像测井的处理方法及解释评价思路。

Based on the characteristics of salinity of formation water and resistivity of formation water with different fluids and the characteristics of reflecting the electrical and oil-bearing properties of electrical imaging logging,method for calculating salinity of apparent formation water was derived in combination with Archie formula,by which the distributive characters of apparent formation water resistivity spectrum of reservoir containing different fluids were qualitatively described,its variables were quantitatively and optimally analyzed.Though the spectral shape and parameters of apparent formation water resistivity spectrum,the reservoir effectiveness and low-contrast reservoir fluid are effectively distinguished.The method is used in many wells of Oilfield and good effect is obtained,by which the idea for process and evaluation of imaging logging is expanded.